220 - age * 0.85 is the normal "expected" heart rate for someone during exercise. I've seen it be much lower (if they take beta blockers) and higher (if healthier) but in general this is a good approximation.
The 220-age value is the upper limit of normal for them... just use this formula against a few different age ranges to get a picture of what is considered normal.
I'm now working with some very old school cardiologists (they've been cardiologists longer than I've been alive and I am not that young). One is one of the inventors of one of the stress test protocols.... anyways I hope to learn a lot from them while I can!
Cheers, Nick
On Tue, Jul 14, 2009 at 09:06, Robert Vroman <r.vroman@...> wrote:
I will come out of “lurker mode”
and give my two cents on this one. I would go with junctional tach for a couple
of reasons. First, the rate is such that if P waves were present they would be
seen. In other words I just do not think it is fast enough for them to be
buried purely because of the rate.
Secondly is the presence of the cannon A
waves. It would be helpful to know if they were regular or irregular (irregular
indicating A/V dissociation), but if I had to make a guess I would guess they
were regular. This is because of the lack of P waves indicating simultaneous
atrial and ventricular depolarization, and simultaneous contraction (resulting
in the A waves).
As far as the subsequent discussion of
rates goes, my understanding is that the category of SVT is not really
considered until the rate is over 150. That is because at rates less than that
if P waves are present they will be seen. However the key word is considered,
and this classification should be a last ditch usage. It is very possible to be
able to identify the actual rhythm at rates over 150, and it can indeed be
sinus as well as others. I have often heard 180 used as the theoretical
upper limit of the sinus node. However is there any evidence to support this? In
school I remember learning the formula Paul mentioned (220 – age). Also I
have not seen it this year in the coverage of the Tour de France, but I
remember a few years ago they would show the riders heart rates which were many
times above 180. I would assume those were sinus rhythms.
This is a woman come in ewith plapitation and normal
BP. Canon A wave was seen.
No P wave can be seen.Rate is less than 150. R wave in Avr lead.
No retrograde P wve can be seen too.
I think is is junbctional tach..what do you guys think?
This is a woman come in ewith plapitation and normal BP. Canon A wave was seen. No P wave can be seen.Rate is less than 150. R wave in Avr lead. No retrograde...
Just to clarify, SVT is an umbrella term for all non-ventricular tachycardias. So the right question is, "What kind of SVT is this?" Tom Sent from my iPhone...
Only because I know someone has the answer...? Where did the rate of 150 come to be the determinant between "SVT" and non?? Why don't all monitors allow the...
That is a horrible EMS myth, Jon. I've reviewed cases where Adenocard was given to sinus tachycardia, simply because it was 160 bpm and "couldn't have been...
Tom: My point is clarified here and in the other posts.? SVT is a largely non-specific term (vs VT) for rhythms with a rate at or above 150, when, really,...
a few things, using heart rate alone is not a good way to make an ecg dx, think about a "nornal" stress test, a 20y old would be expected to hit 200bpm (sinus)...
What kind of SVT is it, Haval Lutfalla? Sinus tachycardia? AF w/RVR? AVNRT? AVRT? Junctional tach? Calling it SVT only points toward a group of abnormal heart...
Chill out all we are on the same side :-). It is important to label things correctly because when you for example say VT everyone knows what you mean, can draw...
Sorry for my quick typing before. I know SVT is a large pool of all kind include the junctional tachycardia. No P wave: not sinus tachycardiaof course...
I will come out of "lurker mode" and give my two cents on this one. I would go with junctional tach for a couple of reasons. First, the rate is such that if P...
Robert just to chime in the heart rate thing. 220 - age * 0.85 is the normal "expected" heart rate for someone during exercise. I've seen it be much lower (if...
Robert Vroman wrote: <snip> "As far as the subsequent discussion of rates goes, my understanding is that the category of SVT is not really considered until the...
"Once you accept that sinus tachycardia is a form of SVT, this view is no longer tenable." This of course may be semantics and the opinions of various people,...
Yes, it does usually cause a distortion of some kind in the preceding T-wave, but if they're all identical (1:1 relationship to the QRS/T) then it's hard to...
Tom- It is hard to get people to understand that, it is far easier to accept the easy term than to read the fine print. ===================================== ...
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